package cn.kgc.layui.util;

import java.security.MessageDigest;

/**
 * Created with IDEA
 *
 * @author: Ycq
 * @Date: 2018/9/5
 * @Time: 17:33
 */
public class MD5 {

    /**
     *
     * @param str
     * @return
     */
    public static String getMD5(String str) {
        MessageDigest md5;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
        char[] charArray = str.toCharArray();
        byte[] byteArray = new byte[charArray.length];
        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

    /**
     * 获取加密密码
     * 加密规则:明文密码加密一次取前18位后10位拼接,再加密一次取第5到25位
     *
     * @param pwd 原密码
     * @return 加密密码
     */
    public static String getEncryptPwd(String pwd) {
        String s = MD5.getMD5(pwd).substring(0, 18) + MD5.getMD5(pwd).substring(MD5.getMD5(pwd).length() - 10, MD5.getMD5(pwd).length());
        return MD5.getMD5(s.toUpperCase()).substring(4, 25).toUpperCase();
    }

    public static void main(String[] args) {
        System.out.println(MD5.getMD5("12345"));
    }
}
